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#include "State.hpp"

#include "openvic-simulation/country/CountryInstance.hpp"
#include "openvic-simulation/map/MapDefinition.hpp"
#include "openvic-simulation/map/MapInstance.hpp"
#include "openvic-simulation/map/ProvinceInstance.hpp"
#include "openvic-simulation/map/Region.hpp"
#include "openvic-simulation/types/fixed_point/FixedPoint.hpp"
#include "openvic-simulation/utility/StringUtils.hpp"

using namespace OpenVic;

State::State(
   StateSet const& new_state_set,
   CountryInstance* new_owner,
   ProvinceInstance* new_capital,
   std::vector<ProvinceInstance*>&& new_provinces,
   ProvinceInstance::colony_status_t new_colony_status,
   decltype(pop_type_distribution)::keys_t const& pop_type_keys
) : state_set { new_state_set },
   owner { new_owner },
   capital { new_capital },
   provinces { std::move(new_provinces) },
   colony_status { new_colony_status },
   pop_type_distribution { &pop_type_keys },
   industrial_power { 0 },
   max_supported_regiments { 0 } {}

std::string State::get_identifier() const {
   return StringUtils::append_string_views(
      state_set.get_region().get_identifier(), "_", owner->get_identifier(), "_",
      ProvinceInstance::get_colony_status_string(colony_status)
   );
}

void State::update_gamestate() {
   total_population = 0;
   average_literacy = 0;
   average_consciousness = 0;
   average_militancy = 0;
   pop_type_distribution.clear();
   max_supported_regiments = 0;

   for (ProvinceInstance const* province : provinces) {
      total_population += province->get_total_population();

      // TODO - change casting if Pop::pop_size_t changes type
      const fixed_point_t province_population = fixed_point_t::parse(province->get_total_population());
      average_literacy += province->get_average_literacy() * province_population;
      average_consciousness += province->get_average_consciousness() * province_population;
      average_militancy += province->get_average_militancy() * province_population;

      pop_type_distribution += province->get_pop_type_distribution();

      max_supported_regiments += province->get_max_supported_regiments();
   }

   if (total_population > 0) {
      average_literacy /= total_population;
      average_consciousness /= total_population;
      average_militancy /= total_population;
   }

   // TODO - use actual values when State has factory data
   const int32_t total_factory_levels_in_state = 0;
   const int32_t potential_workforce_in_state = 0; // sum of worker pops, regardless of employment
   const int32_t potential_employment_in_state = 0; // sum of (factory level * production method base_workforce_size)

   fixed_point_t workforce_scalar;
   constexpr fixed_point_t min_workforce_scalar = fixed_point_t::_0_20();
   constexpr fixed_point_t max_workforce_scalar = fixed_point_t::_4();
   if (potential_employment_in_state <= 0) {
      workforce_scalar = min_workforce_scalar;
   } else {
      workforce_scalar = std::clamp(
         (fixed_point_t { potential_workforce_in_state } / 100).floor() * 400 / potential_employment_in_state,
         min_workforce_scalar, max_workforce_scalar
      );
   }

   industrial_power = total_factory_levels_in_state * workforce_scalar;
}

/* Whether two provinces in the same region should be grouped into the same state or not.
 * (Assumes both provinces non-null.) */
static bool provinces_belong_in_same_state(ProvinceInstance const* lhs, ProvinceInstance const* rhs) {
   return lhs->get_owner() == rhs->get_owner() && lhs->get_colony_status() == rhs->get_colony_status();
}

StateSet::StateSet(Region const& new_region) : region { new_region }, states {} {}

size_t StateSet::get_state_count() const {
   return states.size();
}

void StateSet::update_gamestate() {
   for (State& state : states) {
      state.update_gamestate();
   }
}

bool StateManager::add_state_set(
   MapInstance& map_instance, Region const& region, decltype(State::pop_type_distribution)::keys_t const& pop_type_keys
) {
   if (region.get_meta()) {
      Logger::error("Cannot use meta region \"", region.get_identifier(), "\" as state template!");
      return false;
   }

   if (region.empty()) {
      Logger::error("Cannot use empty region \"", region.get_identifier(), "\" as state template!");
      return false;
   }

   std::vector<std::vector<ProvinceInstance*>> temp_provinces;

   for (ProvinceDefinition const* province : region.get_provinces()) {

      ProvinceInstance* province_instance = &map_instance.get_province_instance_from_definition(*province);

      // add to existing state if shared owner & status...
      for (std::vector<ProvinceInstance*>& provinces : temp_provinces) {
         if (provinces_belong_in_same_state(provinces.front(), province_instance)) {
            provinces.push_back(province_instance);
            // jump to the end of the outer loop, skipping the new state code
            goto loop_end;
         }
      }

      // ...otherwise start a new state
      temp_provinces.push_back({ province_instance });

   loop_end:;
      /* Either the province was added to an existing state and the program jumped to here,
       * or it was used to create a new state and the program arrived here normally. */
   }

   state_sets.push_back({ region });

   StateSet& state_set = state_sets.back();

   // Reserve space for the maximum number of states (one per province)
   state_set.states.reserve(region.size());

   for (std::vector<ProvinceInstance*>& provinces : temp_provinces) {
      ProvinceInstance* capital = provinces.front();

      CountryInstance* owner = capital->get_owner();

      State& state = *state_set.states.insert(
         /* TODO: capital province logic */
         { state_set, owner, capital, std::move(provinces), capital->get_colony_status(), pop_type_keys }
      );

      for (ProvinceInstance* province : state.get_provinces()) {
         province->set_state(&state);
      }

      if (owner != nullptr) {
         owner->add_state(state);
      }
   }

   return true;
}

bool StateManager::generate_states(
   MapInstance& map_instance, decltype(State::pop_type_distribution)::keys_t const& pop_type_keys
) {
   MapDefinition const& map_definition = map_instance.get_map_definition();

   state_sets.clear();
   state_sets.reserve(map_definition.get_region_count());

   bool ret = true;
   size_t state_count = 0;

   for (Region const& region : map_definition.get_regions()) {
      if (!region.get_meta()) {
         if (add_state_set(map_instance, region, pop_type_keys)) {
            state_count += state_sets.back().get_state_count();
         } else {
            ret = false;
         }
      }
   }

   Logger::info("Generated ", state_count, " states across ", state_sets.size(), " state sets.");

   return ret;
}

void StateManager::reset() {
   state_sets.clear();
}

void StateManager::update_gamestate() {
   for (StateSet& state_set : state_sets) {
      state_set.update_gamestate();
   }
}